std.experimental.collection.functional.slist

[Andrei Alexandrescu via Digitalmars-d]

First pass illustrating the basic data layout:

http://dpaste.dzfl.pl/0d4a589ad6f5
Code is obviously barebones but passes tests and works with allocators.

Notes:

* I managed to not store one allocator per node, but there's one 
allocator per range. That's needed if we want "orphan ranges" to work, 
i.e. ranges that survive the list they came from. This is a clasic 
convenience vs. efficiency thing.

* There's a refcount per node because any given node may belong to 
multiple lists.

* Refcounting is interesting because many nodes are only used by the 
previous node. So destroying a list is... funny. Never saw or wrote code 
like this previously. See nukeTransitively.

All in all things seem convex. Please destroy appropriately.


Thanks,

Andrei